四个数字有多少种组合不重复公式

简介：The one who rushed to the front was Dong Qi. When he saw his most capable soldier and his own nephew lying in a pool of blood under the carriage, not knowing whether he was alive or dead, Dong Qi's eyes immediately turned red. He let out a loud cry and fired his long bow fiercely. He slapped his horse and chased the fleeing moustache.